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    Tap conductor 10 feet

    I have 1600A main breaker whose load side 400A 2 sets of 3/0 awg conductors are tapped 10 feet and terminate in
    non fuse 400A disconnect. The conductors then continue 150 feet load side of non fuse disconnect to 400A main breaker panel.

    Inspector said at the 400A non fuse disconnect the tap conductors do not stop unless fuses are provided. I quoted 240.21(B)(1): tap conductors are not less than the rating of the device supplied by the tap conductors at the termination of the tap conductors. Inspector gave me a weird look and said i'll be going now.

    Information note at the bottom of 240.21(B)(1) is for panelboards not disconnect. Am I missing something?

    Sent from my SM-G935U using Tapatalk

    #2
    Originally posted by hhsting View Post
    I have 1600A main breaker whose load side 400A 2 sets of 3/0 awg conductors are tapped 10 feet and terminate in
    non fuse 400A disconnect. The conductors then continue 150 feet load side of non fuse disconnect to 400A main breaker panel.

    Inspector said at the 400A non fuse disconnect the tap conductors do not stop unless fuses are provided. I quoted 240.21(B)(1): tap conductors are not less than the rating of the device supplied by the tap conductors at the termination of the tap conductors. Inspector gave me a weird look and said i'll be going now.

    Information note at the bottom of 240.21(B)(1) is for panelboards not disconnect. Am I missing something?

    Sent from my SM-G935U using Tapatalk
    Yes. First of all, the part I have put in red, is not what the code says (I think before 2014 it said something along what you have but not 2014 and later). Second, read the whole tap rule, specifically 240.21(B)(1)(2). Third, you cant "tap a tap" so even if you could end the tap in the NF disco, you cant come off it with another tap (let alone one that is 150 feet).
    Ethan Brush - East West Electric. NY, WA. MA

    "You can't generalize"

    Comment


      #3
      Originally posted by electrofelon View Post
      Yes. First of all, the part I have put in red, is not what the code says (I think before 2014 it said something along what you have but not 2014 and later). Second, read the whole tap rule, specifically 240.21(B)(1)(2). Third, you cant "tap a tap" so even if you could end the tap in the NF disco, you cant come off it with another tap (let alone one that is 150 feet).
      Electrofelon my buddy thank you

      Comment


        #4
        Originally posted by hhsting View Post
        Mr. Electrofelon my buddy thank you

        Sent from my SM-G935U using Tapatalk
        No debate this time?
        Ethan Brush - East West Electric. NY, WA. MA

        "You can't generalize"

        Comment


          #5
          Originally posted by electrofelon View Post
          No debate this time?
          No its quite clear written in 2014 book word for word and also cant tap a tap as you said.

          Comment


            #6
            Originally posted by hhsting View Post
            I have 1600A main breaker whose load side 400A 2 sets of 3/0 awg conductors are tapped 10 feet and terminate in
            non fuse 400A disconnect. The conductors then continue 150 feet load side of non fuse disconnect to 400A main breaker panel.
            That is one long tap!!!!

            Without looking it up, you may be able to get away with it outside, but not in a building.

            Comment


              #7
              Originally posted by Cow View Post
              That is one long tap!!!!

              Without looking it up, you may be able to get away with it outside, but not in a building.
              Yes, to outside.

              Why a non fused disconnect? I find the fused are usually less expensive. That is an expensive used item to have sitting in the store room.
              Tom
              TBLO

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                #8
                If outside the NF disconnect isn't really needed code wise.
                I live for today, I'm just a day behind.

                Comment


                  #9
                  Post #1 installation is inside building main electric room.

                  Comment


                    #10
                    Originally posted by hhsting View Post
                    Post #1 installation is inside building main electric room.
                    Do you think it is a good idea to run such long length of 400 amp conductors inside your building with 1600 amps of overcurrent protection ahead of them?

                    Put in fused disconnect and eliminate the main breaker in the panel if you want to minimize cost and still be code compliant. (though it is too late now for such a decision)
                    I live for today, I'm just a day behind.

                    Comment


                      #11
                      Originally posted by hhsting View Post
                      Post #1 installation is inside building main electric room.
                      SOL. (So Outta Luck)
                      Tom
                      TBLO

                      Comment


                        #12
                        I'll just do what inspector asked put in fuse disconnect fused at 400A.

                        Sent from my SM-G935U using Tapatalk

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